How to check if contains array in c#?

Question

string[] arr1 = new string[] { "one", "two", "three" };
string[] arr2 = new string[] { "two", "three" };

I have to know if arr1 contains all string of arr2.

How to do it by coding faster?If there is a way by using lambda?

Thank you.

Can `arr1` have any duplicates in it (e.g. can `one` be there twice)? Can `arr2` have any duplicates in it (e.g. can `two` be there twice)? — mjwills, Jun 07 '18 at 03:58

score 1 · Answer 1 · answered Jun 07 '18 at 04:01

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var isSubset = arr2.Except(arr1).Any() == false

answered Jun 07 '18 at 04:01

cwharris

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score 0 · Accepted Answer · edited Jun 07 '18 at 05:44

0

You can use Linq.

arr2.All(x => arr1.Contains(x));

edited Jun 07 '18 at 05:44

Amit

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answered Jun 07 '18 at 03:55

Ilan Keshet

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All of answer can do it,but I think this is the easiest way.Aha – 102425074 Jun 07 '18 at 05:25
You might want to use bool isSuperset = new HashSet(arr1).IsSupersetOf(arr2); for larger collections, it will run quicker. – Sondre Jun 07 '18 at 05:41
@Sondre Thank you! – 102425074 Jun 07 '18 at 07:22

score 0 · Answer 3 · answered Jun 07 '18 at 03:59

You can use linq to solve your problem:

Here we check that if there is any element present in the child list(i.e arr2) which is not contained by the parent list(i.e arr1).If none such exists then the list is subse of the other

eg:

bool isSubset = !(arr2.Any(x => !arr1.Contains(x)));

How to check if contains array in c#?

3 Answers3